Yes, for if you do not, you are in the camp of anti-Christ, as it is written:
1 John 4:3 KJB - And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.
2 John 1:7 For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.
Not joking here, because to deny this, means you teach no victory over sin in the flesh you have, and Christ Jesus had something which you do not have, which means you teach living in sin, because you have excuse, your flesh is different that what Christ Jesus had ...
The "Flesh" of Christ Jesus Subpoint:
Hebrews 2:16 - For verily he took not on him the nature of angels; but he took on him the seed of Abraham.
The question then is, what kind of nature do unfallen [ooops, I gave it away] Heavenly Angels have, as opposed to every child of fallen Adam, and since Jesus did not take on that nature of Heavenly angels, that only leaves the other.
Romans 1:3 - Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh;
If it were not so, Jesus could never have "condemned sin in the flesh", being His flesh that He took upon Himself.
Romans 8:3 - For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: [for "likeness" see Philippians 2:7; Romans 6:5]
It really is simple, eh?
1 Peter 4:1 - Forasmuch then as Christ hath suffered for us in the flesh, arm yourselves likewise with the same mind: for he that hath suffered in the flesh hath ceased from sin;
Hebrews 2:17 - Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people.
Galatians 4:4 - But when the fulness of the time was come, God sent forth his Son,
made of a woman, made under the law,
That "law", is refernce to the law of heredity, the law of "kind" from Genesis, and in 1 Corinthians 15, flesh begets flesh:
John 3:6 KJB - That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
Jesus was born of the same fallen sinful flesh and heritage of flesh as Mary, but also born of the pure and Holy Spirit:
Luke 1:35 KJB - And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
Romans 5:19 - For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous.
Because Christ Jesus was victorious in the same "flesh", so too can we, by the Holy Spirit, and "overcome"
"even as" He "overcame" (Revelation 3:21)
The lineage of Jesus given in both Matthew 1:1-18; "son of David, the son of Abraham" and Luke 3:23-38; "[son of] Adam", etc, see his ancestors. Jesus temptations were far greater than we will ever have to know because of who He is.
How many sons of Adam were born from Adam after His sin? All of them. Jesus, being born of Mary [Matthew 1:16], who was of the line, the seed according to the flesh, of David, sinful, though His spirit was Holy - Divinity and Humanity.
David acknowledges his heritage in the Psalms 51, and Jesus is called the "son of David", the "son of Abraham".
To be born with sinful flesh is not to be born a transgressor/sinner. The scripture teaches that to [commit] sin [of commission or omission] is to be a transgressor [of the Law], not simply being born with sinful flesh.
The "flesh" [sarx]:
"And the Word was made flesh and dwelt among us..." [John 1:14]
"GOD manifest in the flesh" [1 Timothy 3:16],
"the LORD from Heaven" [1 Corinthians 15:47],
"But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law" [Galatians 4:4],
"made of the seed of David according to the flesh" [Romans 1:3],
"...to every seed his own body..." [1 Corinthians 15:38],
"...of the fruit of his [David's] loins, according to the flesh..." [Acts 2:30]
of the "seed of Abraham" [Hebrews 2:16],
even "as the children are partakers of flesh and blood, he also himself likewise took part of the same" [Hebrews 2:14] [what flesh are we born with, that He partook of then, what blood?]
and "in all things it behoved him to be made like unto [his] brethren" [Hebrews 2:17],
that we might have "...known Christ after the flesh..." [2 Corinthians 5:16],
and scripture giving us the family line and genealogy of that very flesh [sarx] and blood nature He took upon Himself [Matthew 1:1-25; Luke 3:23-38]
the "[the son] of Adam" [Luke 3:38]
as it is said, "made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men" [Philippians 2:7], [word "servant" is actually "slave", this makes a difference in the matter of the fleshly nature]
and "...in the days of His flesh..." [Hebrews 5:7],
"was in all points tempted like as [we are yet] without sin" [Hebrews 4:15],
and in His death it is written, "...my flesh shall rest in hope..." [Acts 2:26], and
"...his [being/person] was not left in the grave, neither his flesh did see corruption..." [Acts 2:31] because He was/is...
...and thereby, in the same likeness of sinful flesh as we, yet living without sin, never having sinned, never once transgressed the Holy Law of God; Jesus showed that with God there is no excuse for sin and thus
"...condemned sin in the flesh." [Romans 8:3];
"...having crucified the flesh..." [Galatians 5:24],
and "...nailing it to His cross." [Colossians 2:4],
"Forasmuch then as Christ hath suffered for us in the flesh..." [1 Peter 4:1];
even "...being put to death in the flesh..." [1 Peter 3:18],
and we are to be "...crucified with Christ..." [Galatians 5:24],
"In the body of His flesh through death..." [Colossians 1:22],
become dead to the penalty of the Law, the 2nd Death, "...by the body of Christ..." [Romans 7:4],
that we might be "...members of His body, and of His flesh, and of His bones." [Ephesians 5:30],
by a "...new and living way, which He hath consecrated for us, through the veil, that is to say, His flesh;" [Hebrews 10:20]
so that we may know this, "...Knowing this, that our old man is crucified with [him], that the body of sin might be destroyed, that henceforth we should not serve sin." [Romans 6:6]
"Wherefore when he cometh into the world, he saith, Sacrifice and offering thou wouldest not, but
a body hast thou prepared me:" [Hebrews 10:5]
How so? Look at the lineage from Genesis ... now look from natural to spiritual bodies ...
"Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness: by whose stripes ye were healed." [1 Peter 2:24]
"By the which will we are sanctified through the offering of the body of Jesus Christ once [for all]." [Hebrews 10:10]
Therefore, we have this hope, "Who shall change our vile body, that it may be fashioned like unto his glorious body, according to the working whereby he is able even to subdue all things unto himself." [Philippians 3:21]
Therefore, it is very important to understand with what flesh Jesus came, not only to the Everlasting Gospel [Genesis 3:15; Revelation 14:6-7, etc], and how Christ Jesus is to save us from sin [Matthew 1:21; not in it] and to redeem us unto God, it is written,
"Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:" [1 John 4:2]
What flesh is John speaking about? The very likeness of sinful flesh we have, of the race of Adam, for he says, "...our hands have handled, of the Word of life." [1 John 1:1]
And it is written of those which refuse this, "And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that [spirit] of antichrist, whereof ye have heard that it should come; and even now already is it in the world." [1 John 4:3]
"For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist." [2 John 1:7]
And who teaches that Jesus did not come in that sinful flesh?
Roman Catholicism, that Mother of Harlots (as she identifies herself in her own writing "Mother of all the churches" and "Mistress", even "Casta Meretrix)), through its Immaculate Conception of Mary Dogma...
...and also her daughters [Apostate Protestantism], which removes from Jesus that flesh nonetheless, even as do the Jehovah's Witnesses [etc] do...
...there are many "...not discerning the Lord's body." [1 Corinthians 11:29]
Please read Romans 5 carefully and prayerfully, and especially see Romans 5:19, for we must overcome even as He overcame in the flesh.